XML-RPC "filter"

[Richard Levasseur]

On Sep 9, 8:53 am, Luigi <luigipai... at libero.it> wrote:
> Dear all,
>
> I'm writing an XML-RPC server which should be able to modify the
> incoming request before dispatching it. In particular I wand to added
> two fixed parameters to the method called: one is the client host
> address, and the other is the user name provided as for Basic
> Authentication (http://u...@www.bla-bla.com).
>
> To do this, at the present I've overwritten the do_POST method of
> SimpleXMLRPCRequestHandler, including at a certain point this code:
>
> ....
> data = ''.join(L)
>
> params, method = xmlrpclib.loads(data)
> user = "unknown"
> if self.headers.has_key('Authorization'):
>   # handle Basic authentication
>   (enctype, encstr) =  self.headers.get('Authorization').split()
>   user, password = base64.standard_b64decode(encstr).split(':')
> params = list(params)
> params.append(self.address_string())
> params.append(user)
> params = tuple(params)
> data = xmlrpclib.dumps(params, methodname=method)
>
> (I slightly modified it to make it more readable at mail level)
>
> It works, but I don't really like it because it completely overwrites
> the do_POST method that in the future Python releases is going to
> change (I verified it). Do you know a better way to do this?
>
> Thanks in advance.
>
> Luigi

I actually wrote a wsgi module for almost this -exact- use case
(having to prepend a user/password to the method calls).  The simple
rpc server and dispatchers didn't give me enough control over the
behavior, so I had to reimplement all the logic surround the loads/
dumps calls, and eventually that just turned into the bulk of the
whole SimpleXMLRPCServer module.  There's a lot of tight coupling in
the _dispatch method, so you'll have to override, monkey patch, or
reimplement it.